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Published on: February 17, 2018
Quantifying the effect of anode surface roughness on diagnostic x-ray spectra using Monte Carlo simulation
A Mehranian1, M R Ay, N Riyahi Alam
1Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, P.O. Box 14155-6447, Tehran, Iran.
Medical Physics
|March 17, 2010
Summary
Anode surface roughness significantly impacts diagnostic x-ray spectra, leading to reduced output intensity and patient dose in aged x-ray tubes. This effect is crucial for accurate imaging and dose assessment in radiology.
Area of Science:
- Medical Physics
- Radiologic Technology
- Computational Imaging
Background:
- Accurate prediction of x-ray spectra is vital for diagnostic radiology.
- Anode surface condition is a key factor influencing x-ray generation.
- Understanding these factors is a longstanding goal in medical physics.
Purpose of the Study:
- To evaluate the influence of anode surface roughness on diagnostic x-ray spectra.
- To assess factors affecting x-ray spectra in clinical settings.
- To utilize Monte Carlo simulations for this analysis.
Main Methods:
- Developed image-based models of cracked anodes using digital images.
- Characterized anode surface roughness (Ra) using SEM and profilometry.
- Employed MCNP4C Monte Carlo simulations, verified against experimental data.
Main Results:
- Anode aging with cracks caused intensity loss (up to 16.8%) and reduced exposure (up to 14.9%).
- Half-value layer (HVL) variations were minor (<2.5%), but increased with roughness.
- Patient entrance skin dose decreased by an average of 15% with increased anode roughness.
Conclusions:
- Anode surface roughness has a non-negligible effect on diagnostic x-ray spectra.
- The impact of anode aging on spectra requires careful consideration in imaging.
- This research contributes to understanding factors influencing diagnostic x-ray output.
